| | Shelley, ID | Forest Lake, MN | United States |
| Population | 4,784 | 20,366 | 329,725,481 |
| Female Population | 50.0% | 51.5% | 50.5% |
| Male Population | 50.0% | 48.5% | 49.5% |
| Median Age | 29.8 | 38.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,441 | 18,447 | 309,327,143 |
| Population - 2000 | 3,813 | 6,798 | 285,036,114 |
| Population - 1990 | 3,536 | 5,833 | 251,960,433 |
| Pop. 2000 to Now | 22.0% | 213.1% | 15.6% |
| Pop. 1990 to Now | 31.6% | 264.9% | 30.8% |
| space4 | | | |
| Population Density | 2,666.7 | 666.9 | 93.4 |
| Land Area | 1.8 | 30.5 | 3,531,905.4 |
| Water Area | 0.0 | 5.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Shelley, ID | Forest Lake, MN | United States |
| Age 0 to 4 | 10.2% | 6.5% | 5.9% |
| Age 5 to 9 | 6.8% | 6.6% | 6.1% |
| Age 10 to 14 | 9.4% | 5.9% | 6.6% |
| Age 15 to 17 | 4.4% | 4.1% | 3.9% |
| Age 18 to 20 | 4.9% | 2.6% | 4.0% |
| Age 21 to 24 | 6.4% | 6.5% | 5.2% |
| Age 25 to 34 | 15.1% | 13.6% | 13.8% |
| Age 35 to 44 | 11.6% | 11.5% | 12.9% |
| Age 45 to 54 | 13.1% | 13.1% | 12.6% |
| Age 55 to 59 | 3.7% | 9.0% | 6.7% |
| Age 60 to 64 | 4.0% | 4.9% | 6.3% |
| Age 65 to 74 | 6.1% | 9.2% | 9.6% |
| Age 75 to 84 | 1.7% | 4.9% | 4.5% |
| Age 85 and over | 2.6% | 1.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Shelley, ID | Forest Lake, MN | United States |
| White | 83.5% | 84.6% | 59.4% |
| Black | 0.0% | 3.0% | 12.2% |
| Asian | 0.0% | 3.6% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 6.1% | 3.4% | 3.2% |
| Hispanic | 10.4% | 4.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Shelley, ID | Forest Lake, MN | United States |
| Married Population | 62.2% | 53.9% | 49.8% |
| Currently Married | 61.0% | 53.3% | 48.0% |
| Married but Separated | 1.2% | 0.6% | 1.8% |
| Single Population | 37.8% | 46.1% | 50.2% |
| Never Married | 23.4% | 30.4% | 33.8% |
| Divorced | 7.1% | 10.5% | 10.8% |
| Widowed | 7.3% | 5.2% | 5.6% |
| space5 | | | |
| Household Size | 3.07 | 2.52 | 2.60 |
| Households | 1,558 | 8,036 | 124,010,992 |
| Family Households | 1,203 | 5,458 | 80,755,759 |
| Married couple, w/children | 43.6% | 29.8% | 30.5% |
| Married couple, no children | 33.1% | 49.9% | 42.9% |
| Non Family Households | 355 | 2,578 | 43,255,233 |
| Single householder, w/children | 18.0% | 12.4% | 15.8% |
| Single householder, no children | 5.2% | 8.0% | 10.8% |